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FWIW.[anecdotal]. I have a friend who works for a big automotive supplier and who focuses on connectors. Takes part in lots of reliability testing He is a big fan of Nyogel for places such as inside the spark plug boots, or the crank sensor plugs, etc. He’s seen water creep up into all kinds of connections. The gel does not conduct current, but it keeps out water/moisture. It does not interfere with the electrical connection (there is plenty of metal on metal contact) It’s incredible to me that the insides of these things corrode, but I would bet we’ve all seen it happen. I use it on my engine grounds as well. I guess time will tell.
re: plugs - I have also had good results with the magnetic gearwrench socket (there is a set of 3 wobbley plug wrenches btw), and there is also a neat tool from Hazet (#2505-2) which has 3 different depth settings. I really like the factory tool, but had the rubber bit stay on a plug once and ngl, it really tripped me up. I glued it back in with 3M black weather seal adhesive. We’ll see how it goes. I think I am leaning towards the magnetic ones for now…
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